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RosettaCodeData/Task/Hofstadter-Q-sequence/PicoLisp/hofstadter-q-sequence-1.l

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(de q (N)
(cache '(NIL) N
(if (>= 2 N)
1
(+
(q (- N (q (dec N))))
(q (- N (q (- N 2)))) ) ) ) )
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